CN216928890U

CN216928890U - Lithium battery cover plate and lithium battery

Info

Publication number: CN216928890U
Application number: CN202220125235.3U
Authority: CN
Inventors: 陈思; 陈鹏; 王明明; 陈明; 吴浩; 陈凯; 杜双龙
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-01-18
Filing date: 2022-01-18
Publication date: 2022-07-08
Anticipated expiration: 2032-01-18

Abstract

The utility model discloses a lithium battery cover plate which comprises a cover plate body, wherein the cover plate body is provided with a liquid injection hole, the liquid injection hole is connected with a transmission channel, the transmission channel is arranged in parallel along two end parts of the cover plate body, and the transmission channel is communicated to the bottom of the cover plate body. The utility model also discloses a lithium battery, which comprises a battery shell, a plurality of winding cores accommodated in the battery shell, electrolyte filled in the battery shell and a lithium battery cover plate, wherein the shell is a cubic cavity, and the side surface of the shell is provided with a reticular channel. The lithium battery cover plate is provided with a transmission channel which can guide the electrolyte to flow to the bottom of the battery core; the side surface of the lithium battery shell is provided with a reticular channel which can accelerate the electrolyte to infiltrate the R corner on the side edge of the winding core.

Description

Lithium battery cover plate and lithium battery

Technical Field

The utility model mainly relates to the technical field of lithium batteries, in particular to a lithium battery cover plate and a lithium battery.

Background

The liquid injection is used as a key process in the manufacturing process of the lithium ion battery, and the performance of the battery is influenced and the production efficiency is also restricted due to the good and bad liquid injection effect. Factors affecting the liquid injection and infiltration of the lithium ion battery are many, such as liquid injection equipment, battery structure, battery materials, liquid injection process and the like.

At present, the commonly used liquid injection modes of a square aluminum shell battery cell comprise isobaric liquid injection and differential pressure liquid injection, and a positive placement mode with an upward liquid injection hole is adopted during battery liquid injection. However, in pursuit of high energy density, the battery pack margin approaches the upper limit; the positive electrode, the diaphragm and the negative electrode are tightly contacted after the winding core in the aluminum shell is subjected to hot pressing and shaping; the diameter of the liquid injection hole is smaller. Based on the above points, when the battery core is injected with liquid, the electrolyte is difficult to flow smoothly inside and reaches the set injection amount quickly.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a lithium battery cover plate and a lithium battery, and the technical scheme is as follows:

the utility model provides a lithium battery cover plate, includes the apron body, the apron body is equipped with annotates the liquid hole, it is connected with transmission channel to annotate the liquid hole, transmission channel follows apron body both ends parallel arrangement, transmission channel communicates apron body bottom.

Furthermore, grooves are formed in the bottom of the cover plate body along the other two end portions of the cover plate body and communicated with the transmission channel.

Further, the cover plate body and the transmission channel are integrally formed.

Furthermore, the transmission channel body is made of corrosion-resistant materials.

Further, still include anodal post, negative pole post and aluminium apron, the apron body coupling has anodal post and negative pole post, the apron upside covers there is the aluminium apron.

Furthermore, an explosion-proof valve is arranged on the aluminum cover plate.

A lithium battery comprises a battery shell, a plurality of winding cores accommodated in the battery shell, electrolyte filled in the battery shell and the lithium battery cover plate.

Further, the shell is of a cubic cavity structure, and the side face of the shell is provided with a reticular channel.

Furthermore, the reticular channel is made of aluminum and has a thickness of 0.2-2 mm.

Further, the reticular passage and the shell are of an integrally cast structure.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model provides a lithium battery.A cover plate of the lithium battery is provided with a transmission channel which can guide electrolyte to flow to the bottom of a battery core; the side surface of the lithium battery shell is provided with a reticular channel which can accelerate the electrolyte to infiltrate the R corner on the side edge of the winding core. When the lithium battery is used for injecting the electrolyte, the gas in the battery core can be exhausted in the process of injecting the electrolyte, the electrolyte injection time is shortened, the phenomenon of one-time liquid injection and spraying is reduced, and the productivity is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a lithium battery cover plate according to the present invention;

FIG. 2 is a schematic diagram illustrating electrolyte flow during electrolyte injection in the prior art;

FIG. 3 is a schematic view of another cover plate for a lithium battery according to the present invention;

FIG. 4 is a schematic view of the electrolyte flow during injection according to the present invention;

FIG. 5 is another schematic view of the electrolyte flow during injection according to the present invention;

FIG. 6 is a top view of a lithium battery cover plate of the present invention;

FIG. 7 is a schematic view of a jellyroll configuration;

fig. 8 is a schematic structural diagram of the housing of the present invention.

The electrolyte injection structure comprises a cover plate body, a liquid injection hole, an electrolyte transmission guide pipe, a groove, a positive pole column, a negative pole column, a groove, an explosion-proof valve, a shell, a mesh channel, a winding core, an angle 301R and a bubble 4.

Detailed Description

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the embodiments described are only a few embodiments of the present disclosure, and not all embodiments. The disclosure may be carried into practice or applied to various other specific embodiments, and various modifications and changes may be made in the details within the description and the drawings without departing from the spirit of the disclosure. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

As shown in fig. 1, a lithium battery cover plate comprises a cover plate body 1, wherein the cover plate body 1 is provided with a liquid injection hole 101, the liquid injection hole 101 is connected with a transmission channel, and the specific transmission channel is composed of two electrolyte transmission guide pipes 102 which are respectively arranged in parallel along two end portions of the cover plate body 1 and communicated to the bottom of the cover plate body 1.

In the prior art, the lithium battery only has one passage of the liquid injection hole, and in the liquid injection process, as shown in the flowing direction of the electrolyte in fig. 2, the electrolyte at the upper end flows downwards, and the shell is a closed space, so that the bubbles 4 in the middle cannot be removed, and the electrolyte at the upper part flows downwards slowly.

In other embodiments, as shown in fig. 3, a groove 103 is formed at the bottom of the cover plate body 1 along the other two ends of the cover plate body 1, and the groove 103 is communicated with the electrolyte transfer conduit 102 to enlarge the passage for the electrolyte to flow downwards.

As shown in fig. 4 to 5, the cover plate of the present invention is connected to an electrolyte transfer conduit 102, which can guide the electrolyte to flow to the bottom of the battery cell, accelerate the removal of gas inside the battery cell during the liquid injection, and shorten the liquid injection time.

In the present embodiment, the cover plate body 1 is integrally formed with the electrolyte transfer conduit 102, simplifying the production process. In other embodiments, the electrolyte delivery conduit 102 is installed inside the cover body 1 by means of an embedded conduit. The electrolyte delivery conduit 102 is made of corrosion-resistant material. Specifically, a plastic member is used.

In the present embodiment, as shown in fig. 6, the battery further includes a positive post 104, a negative post 105, and an aluminum cover plate, the positive post 104 and the negative post 105 are connected to the cover plate body 1, and the cover plate, the positive post 104, and the negative post 105 are sealed by the aluminum cover plate. The aluminum cover plate is provided with an explosion-proof valve 106, so that safety guarantee is provided for the lithium battery.

As shown in fig. 7, the winding core 3 is a core formed by combining winding methods, an R-angle 301 is formed on the side surface of the winding core 3 produced by the winding process, and the electrolyte is difficult to flow to the R-angle 301, so that the R-angle 301 of the winding core is difficult to soak. Therefore, as shown in fig. 8, the case 2 of the lithium battery has a cubic cavity structure, and the lateral surface of the case 2 is provided with a mesh passage 201. Specifically, a mesh passage 201 extends along the housing 2 on both sides of the corner 301 of the roll core R. When the electrolyte flows downwards through the cavity, part of the electrolyte can flow to the side face R corner 301 of the winding core through the meshes, and the winding core 3 is accelerated to absorb more electrolyte. The reticulated channels 201 may not extend to the bottom of the shell 2, facilitating the electrolyte to soak into the bottom of the winding core 3. The reticular passage 201 is made of aluminum and has a thickness of 0.2-2 mm. The mesh channel 201 may have a circular or rectangular shape. The net-shaped channel 201 and the housing 2 are integrally cast, or aluminum net may be welded in the two side walls of the housing.

A lithium battery comprises a battery shell 2, a plurality of winding cores 3 accommodated in the battery shell 2, electrolyte filled in the battery shell 2 and a lithium battery cover plate 1. The lower end of an electrolyte injection hole 101 in the cover plate is connected with two electrolyte transmission guide pipes 102, most of electrolyte is directly injected into the top of the winding core 3 through the electrolyte injection hole 101, and then the battery core is downward infiltrated; the rest electrolyte can rapidly flow into the reticular channel 201 on the side wall of the aluminum shell through the guide pipe and then flows downwards to the bottom of the winding core 3, and the electrolyte infiltrates the pole piece and the diaphragm in the winding core 3 from bottom to top. Electrolyte forms the trend of soaking downwards and bottom electrolyte upwards simultaneously in casing 2, and casing 2 inside gas is got rid of when accelerating to annotate the liquid, shortens and annotates the liquid time.

In the description of the present invention, it is to be understood that the terms "intermediate", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, are used for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature may be "on" the second feature in direct contact with the second feature, or the first and second features may be in indirect contact via an intermediate. "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above description is for illustrative purposes only and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention should be included within the scope of the present invention as defined by the appended claims.

Claims

1. The utility model provides a lithium battery cover plate, its characterized in that, includes the apron body, the apron body is equipped with annotates the liquid hole, it is connected with transmission channel to annotate the liquid hole, transmission channel follows apron body both ends parallel arrangement, transmission channel communicates apron body bottom.

2. The lithium battery cover plate as claimed in claim 1, wherein grooves are formed at the bottom of the cover plate body along the other two ends of the cover plate body, and the grooves communicate with the transfer passages.

3. The lithium battery cell cover plate as claimed in claim 1 or 2, wherein the cover plate body is integrally formed with the transfer passage.

4. The lithium battery cover plate as claimed in claim 3, wherein the transmission channel body is made of a corrosion-resistant material.

5. The lithium battery cover plate according to claim 1, further comprising a positive post, a negative post and an aluminum cover plate, wherein the positive post and the negative post are connected to the cover plate body, and the aluminum cover plate covers the upper side of the cover plate.

6. The lithium battery cap plate of claim 5, wherein the aluminum cap plate is provided with an explosion-proof valve.

7. A lithium battery, comprising a battery case, a plurality of winding cores accommodated in the battery case, an electrolyte filled in the battery case, and a lithium battery cover plate according to any one of claims 1 to 6.

8. The lithium battery of claim 7, wherein the housing has a cubic cavity structure, and the lateral surface of the housing is provided with a mesh passage.

9. The lithium battery of claim 8, wherein the reticulated channels are aluminum and have a thickness of 0.2 mm to 2 mm.

10. The lithium battery of claim 8, wherein the reticulated channel is a one-piece cast structure with the housing.